Method of shaping sheet metal into bilged barrel-shells.



a E. Ml-TTINGER, JR. METHOD OF SHAPING SHEET METAL INTO BILGED BARREL SHELLS.

i AHLIGATION FILED MAR. 9, 1912.

Patented Oct. 29, 1912.

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L G. B. ,MITTINGER, JR.

METHOD OF SHAPING SHEET METAL INTO BILGBD BARREL SHELLS.

APPLICATION FILED MAR. 9, 1912.

Patented 001;. 29, L912.

2 SHBETSSHEET 2,

' To all whom 'it may concern:

- enonen nucnuu rnr'rmenn, m, or New CASTLE, mag um,

1115131101) in SHAPING snnnr METAL Inro IBILGED Be it known that I, GEORGE E. Mrrrmonn, Jr., a citizen of the United States, residing at New- Castle, in 'the county of vLawrence and State of Pennsylvania, have invented certain'new and useful Im rovements in the Method of Shaping Sheet etal intoBilged BarrelShe1ls, specification, reference being had therein to the accompanying drawing.

Thi sginvention relates to improvements in the method. of shapingsheet metal into bilged barrel shells, and the primary object thereof is the production of a bilged metal barrel shell from a single sheet of metal, without any material stretching thereofor any material disturbance of the molecules of the metal, with the result that a metal bilged barrelwithout any weak places in the metal is roduced.

feature of my present inven-' tion comprises .a method by which a bilged barrel shell is produced from a sheet ofcold metal by two operations, the shell needin the securing shaped t at a'b'i ,ducedtherefrom Q eriition. 3

only .the suitable seaming of its edges an of suitable heads therein to make a completed metal barrel.

A further feature of my present invention is the roduction of .an initial blank so ed barrel shell can be proy a single succeeding op- A further feature'of my present invention is the production of ,theaforesaid initial blank by a single operation so shaped that a bilged barrel shell can bemade therefrom by; a. single succeeding o ducing a bilged barrel s ell by two operations.

My improved method consists in taking a sheet of metal and forming therein two parallel curved and bilged bends and a longitudinally extending reverse bend therebeeration, thus proof which the following is a larged central portion 5.

tween, and then forcing this intermediate reverse bend into a curved and bilged" form corresponding with the curve andbilge of the saidparallel bilge bends, which action forms the completedbilged barrel shell.

Reference will hereinafter be made to such' portions of the dies or apparatus used to form the initial blank, and to the carry mg out of the complete method, as will enab e the invention to be readily understood.

Referrin to the accompanying drawings, in which like reference characters indicate the same parts: Figure 1 is a perspective male and female dies BARREL-SHELLS.

Specification of Iiettcrs Patent. Patented0t 29 1912,v Application filed March 9, 1912. Serial No.

.barrel .shell, the initial blank being shown in its position in respect to said dies. Fig. 5 1s a perspective vlew showing the position of the dies after they have acted upon the initial blank, and showing also the completed bilged barrel shelLf In carrying out my invention for producmg the initial blank, I provide a female die 1, which is provided with two parallel curved recesses 2, and these recesses have, what I term expanded or bilged portions 3, i and a-central projection 4. This central projection 4 is centrally located between the curved'cavities 2 and is gradually widened from its ends to its center, formingan en- The male die 6 is provided with parallel projectio'ns7, shaped to correspond with the curved cavities 2 of the female die 1, and with a central longitudinally extending recess 8, corresponding in form and shape to the rojection 4 of the female die.-

-The sheet of metal '9 to be acted u on is placed on the female die as shown inldotted lines Fig. 1, and the male die is forced, downward carr ing the metal sheet into the recesses 52 and ibrming what; I term an initial blank 10, which corresponds in sha e to the. shape of the dies; that is to say, it as a 1 A S. F T NI 0FFI0E-* reverse bend 4, the curved bends or recesses I 2' and the bilged portions 3 and also the widened central portion 5 of the reverse bend 4'. This blank 10 also preferably has laterally extending flanges 11 at the-longitudinal edges of'the blank. Y

The aforesaid diesare preferably so shaped that the blank from approximatel the points a,'b, is of a shape or contour whic corresponds with the shape andcontour of the completed bilged barrel shell, and also of the completed bilged barrel, and the distance between the points a, b, of each of the curved recesses or cavities 2 is referably approximately three-fourths of t 11of H e diamg' ter of the barrel, while the distance between the points 6 is approximately two-eighths' or one-fourth of the diameter of the barrel,

but not, of course, of a shape corresponding to the shape of the barrel.

' From the foregoing it will be observed, that in-a single operation, I form from a cold sheet of metal an initial blank which has a bilged barrel shape of approximately three-fourths of the completed barrel shell or barrel, and thus it may be aptly referred to as the major portionof the barrel. It will also be noted that the reverse bent or projection of the initial blank is of an area constituting approximately one'fourth of the area of the completed barrel shell, or barrel, and may thus be aptly referred to as the minor portion of the barrel. I do not Q limit myself in respect to these dimensions of the several operations, and have referred to them as the preferred manner of carrying 'my method into effect, but these dimensions may be varied withoutdepar'ting from the spirit and scope of the broad inventive idea herein disclosed. I also wish to mention that the flanges 11, shown in dotted lines, may be omitted or retained. These flanges are merely for the purpose of 'enabling a lock seam to be formed, but I desire it to be understood that the flanges may be omitted and the abutting edges of the shell joined in any well-known suitable manner, though at this time I prefer to form the blank with the flanges so that a lock seam may be formed. Attention is also directed to the .fact tha-t preferably the top of the reverse bend 4 of i the initial blank is not as high asthe outer edges of the curved bilged recesses 2, and

may be aptly described as beinga planef, below the plane of the outer edges of said recesses. 1

The initial blank having been formed, it

is placed in the position shown in Fig. 4, on

a female die 12, and in such position that its projection 4 is centrally located over the,

curved and bilged recess 13 of the female die 12. A male die 14 having its under side 15 curved and bilged to correspond with the recess 13 of the die 12, is forced downj ward on the reverse bendt of the initial blank, and the reverse bend of the blank is -upset and carried downinto the position shown n Fig. 5, thus causingthe reverse ,;bend to take the shape of the dies and thus complete the bilged barrel shellz16. .The

.male diel t is ofa size to be approximately one-fourth of the diameter of the completed barrel shell which is the length of the metal contained in the reverse bend 4, of the -;-initial blank.

;Of course, it will be understood that any a suitable press or other mechanism willcentrally engage-the pressure beam 17 of the die l to force it, down and. to enable the finished barrel .shellto be removed,the leg 18 of the ipressure :beam. is hinged *sothat it can be swung .out, as shown in dotted lines Fig. 5, and thus permitthc'completcd shell to be removed from the dies.

I do not limit myself to the exact disclosure herein made, for it may be varied without departing from the spirit and scope of my invention so long as it embodies the feature of producing a bilged metal barrel shell by forming an initial blank from a single sheet of metal with parallel curved bilged bends or recesses and an intermediate reverse bend, and then upsetting or forcing the reverse bend into a bilged curve corresponding with the curve or bilge of said parallel bends.

Having thus described my invention what I claim and desire to secure by Letters Patent is: o

1. The method of shaping sheet metal into a bilgcd barrel shell, which consists in forming an initial blank from a metal sheet with two parallel bilged bends and an intermediate parallel reverse bend with gradually increasing amountof metal at its center,

and then upsetting and shaping tliereverse bend into a curve and bilge correspondin with the curve and bilge of said paralle bends. 9 v,

2. The method of shaping sheet metalinto a bilgcd barrel shell, which consists in forming an initial blank from the sheet with two parallel bilged bends and an intermediate parallel reverse bend gradually widening from itsends to its center, and then upsetting and shaping said reverse bend inton curve and bilge corresponding with y the curve and bilge ofsaid parallel bends. I 3. The method of shaping sheet metal into a bilged barrel shell, which consists in forming aninitial blank from the sheet, with two parallel curved and bilg'ed bends, and shaping the combined curve and bilge of the bends with an area. equal to the major portion of the barrel shell, and forming a. reverse intermediate b -d-of minor area ofthe completed. shell, and then upsetting and shaping this reverse bend into a curve and bilge corresponding with the curve and bilge of the completed barrel shell.

t. The method ofshaping sheet metal into a bilged barrel shell, which consists in forming an initial blank from a sheet, with parallel curved and bilged bends, forming the bottom and outer sides of thebends with a curve and bilge corresponding with the curve and bilge of the completed barrel shell, and forming a reverse bend between said parallel bends and of such shape as tothrow the inner sides'of said recesses. mt of said barrel curve and bilge, and then upsetting and shaping said reverse bend and the inner sides of said parallel recesses "into a curve and bilge corresponding to the curve'and .bi-lge of the outer sides of said parallel bends.

the curve and bilge of the outer SlHQ parallel bends to bring the outer edges of the parallel bends together and upset and shape the reverse bend into a curve and bilge 15 corresponding to the curve and bilgeof the outer sides of said parallel bends.

In testimony whereof I hereunto afiix my signature in the presence of two Witnesses.

GEORGE EUGENE MITTINGER, JR.

Witnesses:

J. M. MARTiN, HOMER C. DRAKE. 

